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Why? I have been using mailbox.org for a few years and I am very happy with it.

Not OP, but the Proton UX / UI is far superior to Mailbox.org - which i personally find hard to navigate and disorganized...

i pay for mailbox.org but i never use the webmailer haha, they support IMAP/SMTP

I agree the web app is not amazing, I use a native mail application.